DTC P0850 [L3]

BME010200800W01

DTC P0850

Neutral switch circuit malfunction

DETECTION CONDITION

• PCM monitors changes in input voltage from neutral switch. If PCM does not detect PCM terminal 1W voltage changes while running vehicle with vehicle speed above 30 km/h {19 mph} and clutch pedal turns press and depress 10 times repeatedly, PCM determines that neutral switch circuit has malfunction
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.

POSSIBLE CAUSE

• Neutral switch malfunction
• Poor connection of neutral switch connector or PCM connector
• Short to ground between neutral switch terminal A and PCM connector terminal 1W
• Open harness between neutral switch terminal A and PCM connector terminal 1W
• Open harness between ground and brake switch terminal B
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
CLASSIFY HIGH INPUT OR LOW INPUT
• Connect WDS or equivalent to DLC-2.
• Access CPP/PNP PID.
• Verify CPP/PNP PID when gear is in neutral position.
• Is CPP/PNP PID always OFF?.
Yes
Go to Next step.
No
Go to Step 10.
4
INSPECT NEUTRAL SWITCH CONNECTOR FOR POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect neutral switch connector.
• Check for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 14.
No
Go to next step.
5
CLASSIFY NEUTRAL SWITCH OR CIRCUIT
• Connect WDS or equivalent to DLC-2.
• Access CPP/PNP PID.
• Connect a jumper wire between neutral switch terminal A and B.
• Is CPP/PNP PID on?
Yes
Go to next step.
No
Go to Step 7.
6
INSPECT NEUTRAL SWITCH
• Perform neutral switch inspection.
• Is neutral switch okay?
Yes
Go to Step 14.
No
Replace neutral switch, then go to Step 14.
7
INSPECT NEUTRAL SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between neutral switch terminal B and ground.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace neutral switch power circuit for open, then Go to Step 14.
8
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 14.
No
Go to next step.
9
INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between neutral switch terminal A and PCM terminal 1W.
• Is there continuity?
Yes
Repair or replace harness for open, then go to Step 14.
No
Go to Step 14.
10
INSPECT NEUTRAL SWITCH CONNECTOR FOR POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect neutral switch connector.
• Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 14.
No
Go to next step.
11
CLASSIFY NEUTRAL SWITCH OR CIRCUIT
• Connect WDS or equivalent to DLC-2.
• Access CPP/PNP PID.
• Verify that CPP/PNP PID changes from ON to OFF when neutral switch connector is disconnected.
• Does CPP/PNP PID change from ON to OFF?
Yes
Go to next step.
No
Go to Step 13.
12
INSPECT NEUTRAL SWITCH
• Perform neutral switch inspection.
• Is neutral switch okay?
Yes
Go to Step 14.
No
Replace neutral switch, then go to Step 14.
13
INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Inspect continuity between neutral switch terminal A and ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground, then go to Step 14.
No
Go to Next step.
14
VERIFY TROUBLESHOOTING OF DTC P0850 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Start engine.
• Clear DTC from PCM memory using WDS or equivalent.
• Drive vehicle above 30 km/h {19 mph} and stop vehicle.
• Depress and release clutch pedal more than 10 times during drive cycle.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
15
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.